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WA bushfires: Blaze claims two lives in state’s south west

Three people feared missing in a bushfire south of Perth have been located alive and well, as work continues to formally identify the bodies of two elderly men suspected of dying in the blaze at Yarloop, where at least 131 homes were destroyed.

Western Australian Police believe the remains belong to two men, aged 73 and 77, who have been missing since the blaze swept across the town on Thursday night.

No formal identification has been made, but the families of both men have been advised of the developments.

"Further forensic work will need to be undertaken once it is deemed safe to do so, and reports will be prepared for the WA coroner," a police spokesman said.

Two men are feared to have died in Yarloop. (9NEWS)

Western Australian Police said it was possible further missing person reports could be made as time went on and are urging all residents from fire-affected areas to register with the Australian Red Cross.

The blaze also wiped out at least 10 other structures in Yarloop, including historic buildings.

A family member, who did not want to be named, told AAP yesterday that she feared Malcolm Taylor had perished because no one had heard from him since Thursday evening before the fire ripped through the town, and he had not registered himself with authorities.

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When she last spoke with the 73-year-old, who requires a hearing aid, he said he was going to stay at his house.

"He goes to bed early, around 7.30pm, so we're worried that he turned off his hearing aid and went to sleep and then the houses went up so quickly."

More than 140 buildings have been destroyed. (9NEWS)

She said the gas bottles outside the house would have blown up and the family was concerned Mr Taylor had been killed.

The family had also seen footage on the news of Mr Taylor's razed house and the remains of his burnt-out car.

"If Malcolm was all right, he would have rung someone by now," she said.

Premier Colin Barnett met with residents at the Pinjarra evacuation centre and said the state government would help rebuild public facilities at Yarloop, although he was unsure how many of the 545 people would return.

"I'm sure there will be a Yarloop, but probably not a Yarloop of its previous size," he said.

Lightning is believed to have sparked the fires. (9NEWS)

Federal MP Andrew Hastie also visited the evacuation centre and passed on the prime minister's sympathy to the victims and admiration for those helping.

Department of Fire and Emergency Services commissioner Wayne Gregson said it had been a challenging bushfire and they were "not out of the woods yet".

An emergency warning remains in place for a large part of the region, including east of Waroona, Hamel, Yarloop and surrounding areas.

More than 72,600 hectares have been burnt and 143 properties destroyed since the lightning-sparked fire began on Wednesday.

Calmer winds are expected to ease the firefighting effort, with a BoM spokesman saying the weather conditions had improved in the region overnight.

The favourable conditions have seen the alert level downgraded to a watch and act for some areas including Waroona, Harvey, Cookernup, Preston Beach and Lake Clifton.

A watch and act alert also remains in place for people in the Dalyup area, west of Esperance, as firefighters work to control a slow-moving blaze.

Disaster assistance will be available for victims under the jointly funded Commonwealth-State Natural Disaster Relief and Recovery Arrangements.

A burnt-out car in Yarloop. (9NEWS)

Four firefighters have been injured battling the blaze, while more than 60 NSW firefighters arrived on Saturday to help fatigued crews.

Several roads and recreation sites remain closed, with dairy farmers forced to dump thousands of litres of milk.

Western Power says thousands of properties remain without power, but burnt trees and debris in danger of collapsing must be cleared before the network can be rebuilt.

There are also concerns for wildlife in the affected areas, with emergency wildlife carers fearing the fires may have devastated the echidna population in bushland near Yarloop.

“We're a bit worried because they're having their babies at this time of year,” Doreen Jones from Emergency Wildlife Care Bunbury told AAP.

“At the moment we’ve had two ring-tailed possums, a brush-tailed possum and a joey has been handed in to various people and vets.”

More than 72,000 hectares have been burnt. (9NEWS)

About 835 people have registered at two evacuation centres and children there have welcomed distractions including horses and players from the Wildcats basketball team.

Material donations are not being officially accepted, but essentials and small gifts have been given to those in need, and animals have been provided with shelter.

The CWA has requested people not bring food to the evacuation centres.

People wanting to help can make monetary donations through the Lord Mayor's Distress Relief Fund and the state government has already committed $1 million.